Tropospheric trace gas concentrations using infrared spectroscopy from space. Meeting report

Transcription

1 Tropospheric trace gas concentrations using infrared spectroscopy from space International workshop held at the Laboratoire Interuniversitaire des Systèmes Atmosphériques (LISA, Universités Paris 7 and Paris 12, CNRS UMR 7583) Nov. 30 Dec. 1, 2006 Meeting report Prepared by Jean-Marie Flaud and Johannes Orphal 1. Opening and Aim of the Workshop. The international workshop Tropospheric trace gas concentrations using infrared spectroscopy from space held at the Laboratoire Interuniversitaire des Systèmes Atmosphériques (LISA) in Créteil from Nov. 30 to Dec. 1, 2006, was proposed in the frame of the ACCENT-TROPOSAT 2 project, in order to provide an opportunity to exchange experience and foster collaborations between different European groups working in the field of infrared spectroscopy from space applied to the remote-sensing of tropospheric trace gases. The number of participants (25) from 7 different countries (France, Belgium, Netherlands, Germany, UK, Canada, USA) clearly demonstrates the great interest and current development of this field. The presentations (16 oral contributions of 30 min each) covered both general aspects, such as spectroscopy and methods for data inversion and assimilation, and results from different infrared sensors, such as IMG, IASI, MOPITT, MIPAS, SCIAMACHY, ACE-FTS, and TES. There are currently an increasing number of infrared satellite sensors, monitoring different tropospheric species such as O 3, CO, SO 2, HNO 3, and several minor constituents such as HCOOH, 1

2 H 2 CO, C 2 H 6, etc., both in Nadir and Limb geometry. At the same time there are several new missions being prepared or developed. The aim of this workshop was to give an overview of the current activities and to exchange new results, and most of all, to provide an opportunity for questions and discussions. 2. Scientific Presentations After a welcome by Jean-Marie Flaud, both as representative of the AT2 Steering Committee and on behalf of the organizers, the workshop started with a first session (chaired by Jim Drummond) focusing on different results from infrared satellite instruments: IMG and the latest news of IASI (presented by Cathy Clerbaux, France), MIPAS (presented by Gabi Stiller, Germany), SCIAMACHY (by Michael Buchwitz, Germany) and TES (by Tony Clough, USA). After a coffee break, the second session (chaired by Tony Clough) covered more general aspects: spectroscopy issues (presented by Jean-Marie Flaud, France), synergistic use of ultraviolet and infrared observations (presented by Jochen Landgraf, Netherlands), a neural network approach for tropospheric ozone retrievals from IMG and IASI (presented by Solène Turquety, France), and stratospheric balloon experiments for validation of infrared Nadir spectra (presented by Sebastien Payan, France). The second day started with the third session (chaired by Cathy Clerbaux), again with results from different infrared satellite instruments: CO from MOPITT (presented by Jim Drummond, Canada), CH 3 OH from ACE-FTS (presented by Gaelle Dufour, France), organic species and PAN from MIPAS (presented by John Remedios, UK) and tropospheric NO y and organic species from IMG and ACE-FTS (presented by Piet Coheur, Belgium). After a coffee break, the last session (chaired by Gabi Stiller) covered different aspects of retrieval: Optimal estimation, regularisation, and instrument calibration (presented by Tony Clough, USA), near-infrared retrieval of CO and CH 4 from SCIAMACHY (presented by Annemieke Gloudemans, Netherlands), aerosols from infrared Nadir spectra (presented by Michel Kruglanski, Belgium) and studies on a priori climatologies for retrieval of tropospheric ozone (presented by Maxim Eremenko, France). 3. Discussion Points After each presentation, there was time for questions and discussions. The most important issues that were discussed during the workshop are: different retrieval methods role of the a priori information impact of systematic errors such as instrument calibration and spectroscopy 2

3 use of data for higher level products future missions using infrared instruments 4. Conclusions and Recommendations The general feedback from all participants was that the workshop was very interesting, in particular since all main aspects of tropospheric trace gas retrievals using infrared spectroscopy from space were covered, and since most of the groups actively involved in this research were present. Many results that were shown were recent or new, and in several cases, still unpublished. As main conclusion, one can state that infrared spectroscopy is a very promising field for atmospheric research and provides significant new results for tropospheric chemistry. There is an increasing number of satellite instruments operating in the infrared that were launched recently or are currently in preparation, and without any doubt, this field of research will continue to grow in the future. 5. Contribution to the current aims of AT2 and ACCENT (see Appendix below) Clearly, the exchange of ideas and presentation of recent results and methods is an activity that fits perfectly into the frame and aims of the ACCENT-TROPOSAT 2 Network of Excellence. The workshop organised at LISA was attended by 25 scientists from 7 different countries, and all groups involved in the infrared subgroup of AT2 task group 1 were represented. (For a detailed list of presentations and attendants, see Annexes below.) 6. Close The international workshop on Tropospheric trace gas concentrations using infrared spectroscopy from space was a real success, and the organisers would like to express their gratitude to the ACCENT-TROPOSAT 2 network for supporting this event. 3

4 Appendix 1 Participants and Affiliations 1. Aben Ilse SRON Utrecht, The Netherlands 2. Barret Brice LA, CNRS Toulouse, France 3. Boynard Anne LISA/SA, CNRS Créteil/Paris, France 4. Buchwitz Michael IUP Bremen, Germany 5. Clerbaux Cathy SA, CNRS Paris, France 6. Clough Anthony AER Lexington, MA, USA 7. Coheur Piet ULB Bruxelles, Belgium 8. De Maziere Martine IASB-BIRA Bruxelles, Belgium 9. Drummond James Dalhousie University Halifax, Nova Scotia, Canada 10. Dufour Gaelle LISA Créteil, France 11. Eremenko Maxim LISA Créteil, France 12. Flaud Jean-Marie LISA Créteil, France 13. George Maya SA Paris, France 14. Gloudemans Annemieke SRON Utrecht, The Netherlands 15. Hadji-Lazaro Juliette SA Paris, France 16. Hurtmans Daniel ULB Bruxelles, Belgium 17. Kruglanski Michael IASB-BIRA Bruxelles, Belgium 18. Landgraf Jochen SRON Utrecht, The Netherlands 19. Orphal Johannes LISA Créteil, France 20. Payan Sébastien LPMAA Paris, France 21. Perrin Agnès LISA Créteil, France 22. Remedios John University of Leicester Leicester, UK 23. Stiller Gabriele IMK-FZK Karlsruhe, Germany 24. Turquety Solène SA Paris, France 25. Vandaele Ann-Carine IASB-BIRA Bruxelles, Belgium 4

5 Appendix 2 Workshop Programme Thursday, Session 1 (Chair: J. R. Drummond) 14:00 C. Clerbaux Current CO measurements in the thermal infrared (IMG, MOPITT, ACE)+ some highlights on volcaneous SO 2 detection 14:30 G. Stiller Atmospheric processes in the UTLS as seen by MIPAS 15:00 M. Buchwitz Three years of SCIAMACHY/WFM-DOAS tropospheric CO, CH 4, and CO 2 15:30 S. A. Clough TES: Level 1B through Level 3, calibration, retrieval strategy, information content, error analyses, global maps, 16:00 Coffee Break Session 2 (Chair: S. A. Clough) 16:30 J.-M. Flaud Spectroscopy Issues 17:00 J. Landgraf Retrieval of Tropospheric Ozone: The Synergistic Use of Thermal Infrared Emission and Ultraviolet Reflectivity Measurements from Space 17:30 S. Turquety Tropospheric ozone retrieval from high resolution IR measurements: IMG, IASI 18:00 S. Payan Validation of IASI with IASI-Ballon (L1 and L2) 20:30 Workshop Diner 5

6 Friday, Session 3 (Chair: C. Clerbaux) 09:00 J. R. Drummond Results from the MOPITT experiment: Six years of continuous CO measurements 09:30 G. Dufour Influence of continental emissions on upper-tropospheric methanol revealed from ACE-FTS satellite observations 10:00 J. Remedios Infrared remote-sensing of organic compounds in the upper tropo sphere 10:30 P. F. Coheur Tropospheric NO y and organic species (ACE-FTS / IMG) 11:00 Coffee Break Session 4 (Chair: G. Stiller) 11:30 S. A. Clough On the role of radiance accuracy, radiance validation, and my per spective on the current status of Forward Model accuracy 12:00 A. Gloudemans SCIAMACHY retrievals of CO and CH 4 in the near-infrared 12:30 M. Kruglanski Retrieval of methane and aerosol load from IASI spectra using ASIMUT 13:00 M. Eremenko Tropospheric O 3 from IASI 13:30 Lunch (Sandwiches, Desserts) 6